MPEG-1 or MPEG-2 Audio Layer III, more commonly referred to as MP3, is a patented encoding format for digital audio which uses a form of lossy data compression. It is a common audio format for consumer audio storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on most digital audio players.
MP3 is an audio-specific format that was designed by the Moving Picture Experts Group (MPEG) as part of its MPEG-1 standard and later extended in MPEG-2 standard. The first MPEG subgroup – Audio group was formed by several teams of engineers at Fraunhofer IIS, University of Hannover, AT&T-Bell Labs, Thomson-Brandt, CCETT, and others. MPEG-1 Audio (MPEG-1 Part 3), which included MPEG-1 Audio Layer I, II and III was approved as a committee draft of ISO/IEC standard in 1991, finalised in 1999 and published in 1993 (ISO/IEC 11172-3:1993.
Backwards compatible MPEG-2 Audio (MPEG-2 Part 3) with additional bit
rates and sample rates was published in 1995 (ISO/IEC 13818-3:1995)
The use in MP3 of a lossy compression algorithm
is designed to greatly reduce the amount of data required to represent
the audio recording and still sound like a faithful reproduction of the
original uncompressed audio for most listeners. An MP3 file that is
created using the setting of 128 kbit/s will result in a file that is about 1/11 the size[note 1] of the CD
file created from the original audio source. An MP3 file can also be
constructed at higher or lower bit rates, with higher or lower resulting
quality.
The compression works by reducing accuracy of certain parts of sound that are considered to be beyond the auditory resolution ability of most people. This method is commonly referred to as perceptual coding. It uses psychoacoustic
models to discard or reduce precision of components less audible to
human hearing, and then records the remaining information in an
efficient manner.
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